Question
The scientific view is that the increase in global temperature should not exceed 2 °C above pre-industrial level. If the global temperature increases beyond 3 °C above the pre-industrial level, what can be its possible impact/impacts on the world?
1. Terrestrial biosphere tends toward a net carbon source
2. Widespread coral mortality will occur.
3. All the global wetlands will permanently disappear.
4. Cultivation of cereals will not be possible anywhere in the world.
Select the correct answer using the code given below.
(a) 1 only
(b) 1 and 2 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4
Answer:
B
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Explanation:
If the global temperature increases beyond 3 °C above the pre-industrial level, it can have the following impacts:
1. Terrestrial biosphere tends toward a net carbon source: This means that the land ecosystems, such as forests, may release more carbon dioxide into the atmosphere than they absorb, contributing to further greenhouse gas emissions.
2. Widespread coral mortality will occur: Coral reefs are highly sensitive to changes in temperature. If the temperature rises beyond 3 °C, it can lead to widespread coral bleaching and mortality, damaging marine ecosystems and biodiversity.
However, the statement (3) regarding all global wetlands permanently disappearing and (4) regarding the impossibility of cereal cultivation anywhere in the world are not directly supported by the given information and scientific consensus on the impacts of a 3 °C temperature increase.